ContextOxytocin (OT) plays a key regulatory role in human social behaviour. While prior studies have examined the effects of OT on observable social behaviours, studies have seldom examined the effects of OT on psychophysiological markers such as heart rate variability (HRV), which provides an index of individual’s motivation for social behaviour. Furthermore, no studies have examined the impact of OT on HRV under resting conditions, which provides an index of maximal capacity for social engagement.ObjectiveTo examine the effects of OT on HRV measures in healthy male participants while at rest. OT was hypothesised to increase HRV, compared to placebo, and that the effects would be greatest for a non-linear measure of HRV (the detrended fluctuation scaling exponent).MethodsTwenty-one male participants were recruited for this study. Participants were non-smokers, not on any medications and reported no history of psychiatric illness, neurological disorder, or any other serious medical condition (e.g. diabetes, cardiovascular disease). The study employed a randomised, placebo-controlled, within-subject, crossover, experimental design.Main Outcome MeasuresHRV was calculated from electrocardiography under a standardized, 10-minute, resting state condition.ResultsAs hypothesised, OT increased HRV and these effects were largest using the detrended fluctuation scaling exponent, a non-linear measure. These changes were observed in the absence of any change in state mood, as measured by the profile of mood states. Importantly, participants were unable to correctly guess which treatment they had been assigned at either of the two assessments.ConclusionsTogether with the broader literature on OT and HRV, findings suggest that acute administration of OT may facilitate a fundamental psychophysiological feature of social behaviour, increasing capacity for social engagement. Findings also suggest that HRV changes may provide a novel biomarker of response to OT nasal spray that can be incorporated into research on response to treatment.

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A substantial empirical base supports the use of psychotherapy to alleviate anxiety symptoms and diagnoses in children and adolescents. However, focusing only on symptom or diagnostic reduction provides an incomplete picture of clinically meaningful efficacy given that anxiety disorders in this age group are integrally associated with problems in functioning. A systematic review and meta-analysis (N studies = 40, N participants = 3094) evaluating the impacts of psychotherapy for anxiety was conducted on the following outcomes: global functioning, social functioning, academic functioning, and school attendance. Randomised controlled trials with a passive control condition, a child and/or adolescent sample (7–17 years) with a primary anxiety diagnosis, and receiving anxiety-focused psychotherapy were eligible for inclusion if they reported suitable outcome data. Results from the meta-analysis indicated that from pre- to post-treatment, psychotherapy led to significant improvements in global functioning according to clinician (d = 1.55), parent (d = 0.67), and child (d = 0.31) reports and on social functioning according to parent (d = 0.51), but not child (d = 0.31) reports. The qualitative review provided preliminary support psychotherapy’s efficacy in increasing family functioning and school attendance, but not so much in enhancing academic performance. These results indicate that psychotherapy improves daily functioning in anxious children and adolescents. The study also highlighted the limited attention paid to measures of functioning in the empirical literature on treatment of childhood anxiety.Trial Registry: This study is registered with PROSPERO under the identification number CRD42021246565.

The present study evaluated the possibility of collecting cardiac vagal tone data using a photoplethysmograph, and its stability and continuity in a longitudinal sample of early-school aged children. A method for the optical (i.e., blood volume pulse) estimation of heart rate was established in a pilot study. Then the longitudinal stability and continuity in photoplethysmograph-derived vagal tone was assessed in 114 children (56 girls) at three sessions between 5 and 7 years of age. Results indicate that this method possesses substantial measurement reliability and individual stability, as children report low intra-individual variation over time. Children also report a mean decrease in vagal tone from 5 to 7 years of age, consistent with increased attentional capacity. Overall, this suggests blood volume pulse estimation of vagal tone is both accurate and appropriate for naturalistic developmental research.

As children develop, what changes in how they understand the behaviours of other people? Research into the development of children's 'Theory of Mind' (ToM i.e. their naïve beliefs about how other minds work and govern behaviour) has primarily focused on whether children predict others' actions considering their beliefs and goals or whether they 'egocentrically' base their predictions on their own mental states (e.g. Wellman, Cross, & Watson, 2001). In both cases, whether the goals are those of the child or of the other person, the assumption is that children predict actions will be in the service of goals-that they are part of rational plans (e.g. Baker, Saxe, & Tanenbaum, 2009; Gergely & Csibra, 2003). However, many behaviours are in fact not based on plans; human actions are routinely rooted in reflexive habits, not reflective plans (e.g.